The Windsor-Detroit Tunnel will close for more than four hours Sunday morning to accommodate the Detroit Free Press Marathon.
The tunnel will be shut down to all vehicle traffic from 6:15 a.m. until 10:30 a.m. as thousands of runners make their way through Windsor before returning to Detroit.
Officials advise anyone planning to cross before the race to do so before 6:10 a.m.
The Ambassador Bridge will have restricted traffic. That means two-way vehicle traffic will be present on one side of the bridge while runners will be on the other. A buffer lane will separate the two.
The Gordie Howe International Bridge will be open.
The tunnel is expected to reopen around 10:30 a.m. Sunday.